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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a683e743fcd8e18b68abf7605c1092f45d20029726769fa2255e1e7999cfeee7' 
  AND token = 'cWmBZ4kuepeLYCNE/KX1/UmmodjfQRd5Jp3t03rfi0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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