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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85974be86a3cb7b97e242f8e38ee3998ff1efa05ba3c3573742989df8ea18ddd' 
  AND token = 'pog4OQ6jOk5cueMyzywcDJty90FudDKAt0a4RYjLELA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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