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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df4d1f19b9f9cdfe253eed4d5d7c6043acc395fd42908a6636820e38637fe9b' 
  AND token = 'JHdZslxjut2KBTPU5q5QWXMQNqlHjf4yZ5EdOECbzqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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