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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1071753ef545766a88b96c8419327957057c259d6eb87304e4bce56af41f573' 
  AND token = 'jcpIhx8XK5zKLPSK4hcIvpLd2W2gt5YalbCaD8dw6gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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