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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809f60330e1a52aa0ab4795ef54a5df54304108e52f1542ce00ac35200332a1b' 
  AND token = 'yzw55wGYYhORbOU0n+YiR/O97UOl8aqNl6d9VKJb96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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