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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c38199c4fb965300ea51dd92eb84119649766c8ff53d397d04ea5c789efe641' 
  AND token = '8ZjWn+l43FfBndrrL1KHOgc2WsOvG736yQi7qWQOFl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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