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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918dcde03838a9b78088d09abefe844a92fcebd50a35b5c7037889e13bb2c2e8' 
  AND token = 'yClRkFYj2SSK7YTTHNPc23d4aBEc2sZ908paNwxQcqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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