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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16f4689fc5044be3cfa1437b1871166cb504a54a8f6a6dfc867f28cc03e808e' 
  AND token = 'GbaT97OOUc57+xk6AJN/Nm2J2wqKAqI5FnE3s8riPqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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