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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ba75b4e117f3ed3d885320697c731c0bc212f4859ee94dc5ff6c5139ea21fc' 
  AND token = 'kRhYo1KOhtQzoC/JhYcu8aH1Y4rxSl+G1/c6Ra1XrzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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