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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1ce67629166d19f16caf72a3f62b3b26bf6cc2da972ea5eea2e777e4c4e5f6' 
  AND token = 'TQe9KIeoEzgr7ErdYArwo9QgTYTsz8zbLu53ZOvN6y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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