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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760a892fd0cb83ace0b762c2d5a3b402798a3b5835032c6004041c6248891201' 
  AND token = 'Je3BNuFXBCL83D5Lxku4cxd28ZucirohEw6Ud813dpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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