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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99c96fac092190c9c145b272ed96359eab830c6ff52652db3540ec9ec8a3e02' 
  AND token = 'rHf0RH0yRH6PaXHpxkxt/h64L4/Nw9lp+mUrRh5cm7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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