SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dabfe0f9eda4fe8352cad85d174649e3991dab68fe3260885cfe2a8bfef60ce' 
  AND token = 'Ayq+WV+xqzlLMj124ppKuI4/NQJ9IhlK36C1P5dGaCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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