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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88caa22356cf5a389ea0fb1a27ad5da6ca33a6e861d1345873e36486c5b6a345' 
  AND token = 'ILzq28w9lgoXc5MXs4dVbXWZGzxJZGZzbPsUztTlyQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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