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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef3683105da494de992bf893ef1bf21818ed3b722d447c22a1f2af46ab47c0a' 
  AND token = 'qQt8U7lrs6yDTW3Dm6G4BpH6LZdhqH1/nXjTPsjLyDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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