SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b9a0293ef226e6353d548d73b2b18c691daa3cfc2171c59f0e20651460a926' 
  AND token = 'VfXY3tPIviFqsdbp0v/wwPh/ejhuic8UMyMHPKh2LpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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