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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6041e50a6ad4d9c8fde16763b802cb3d2af82af87f7e7b81f51169c2f222143f' 
  AND token = 'adjAjFf0KZmcj0pt66dbmqGfICwYHp2m+GG4+eb/BH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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