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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c66ba1bfc64288cf7a76f295e27b6a570f555c12cbca9cedd59f41fb7b14be7' 
  AND token = 'O1q3WwX2VPNxe0SI5Ar6r9cFMo/gac+CuqnX77O1FeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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