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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f287b1348c6707582aadaa9301021b5a4556c795164cc211d6562007f7506e' 
  AND token = 'aHC0KK6W4b2o/WG8ABxnINOoyPD67EEyN70yU6Ev1gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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