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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d87916775c3348549929baa50cda45e12c5cc90cfe1cb3abe6ea29a9d1778c' 
  AND token = 'VwnkMBYtqOwVhbk3gp4tP4EHZM0lf5mPoaEYpGvd+nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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