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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471b0df65d89ca415404217321098807082886b30da75b12e818fa890ba9024e' 
  AND token = '5hYxJHH3I8Q+H45NkhcDMsDt4FGDiDcJ5efUNWj1izI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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