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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f57fb3cacce085a6367273f31c60de931c48eaf0b8cefec37c138b9e1c2bf37' 
  AND token = '5pbk7m/dtkghVKywWezQS7+xFzj6zuIZPTJ1gTeWhPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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