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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e6ba83639eb49e5a2a746bfaa7f84e894ebcdb50c9a31ca416a814fce6a398' 
  AND token = 'S0/Ns4F1Qr9qTQICNbaDT5tYIgWRWp9UpkN5fH9sPaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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