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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c129e5780de8e5c65871e75660a30c09b207754cda5ba5e1c0034b8bb2587a3' 
  AND token = 'lqhMKXtk6QZQk4pfpwv9XT83JVegOX3fOdvuO+XKz2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}