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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f9191aee4af9401171632451c6b32c613e0b9a04e2fe4f462187715718c48a' 
  AND token = 'lmlVOiUg2YgZjyweHUUqexHuH9LHYFQN4AX15TPoONE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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