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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199608cb290d703f3ff64bc9ec52f54e1541ce97591d68b86b5a8a9461088573' 
  AND token = 'e0aYlQ8LiZK2N6QuflVdFprT05Wjc6jsqoQbw+30vI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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