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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a90d4a75aa00ecbb8d1b18401ad8c72d785d551c4f38a92ab4c49f4c5834648' 
  AND token = 'RZ44X6YQxhYqD6z/S2xGZ5KkX95JA1RGYWmX0ayi7/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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