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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d277b8c57e4c176e67350c2cea0f98ba8f95037a6a18fd4058ccf528147f8d' 
  AND token = 'axlAKGyDTZGhciXf7Ygmy6+TFtxU9jrAnHAESCTncCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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