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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be931ccabf5b407721f7a8e30c1fdf232a14c31b9d31c2756752bdbed53d3165' 
  AND token = 'EcffaMO4a1BBEpujhwmiyG8di5C7g3WsGPZ9dZIDd28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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