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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa2b2c4a132001d0e14a853944f00a8d9bbc3844313bdb8c4f458d1c516805d' 
  AND token = 'qYNPTQiOh9vUb8BXswvc0oqqazD0WqoYfvYaJKDyby8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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