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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c956cf6a67be6467ab96350c1a95d8c9aa077da25e44465ac68ec0192e1719' 
  AND token = '/8AL4ac+jdz+7S9pl6LOE4wnbJ+hzjNkO+VN6W3789Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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