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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0caca6719a9fdaa1f14a0bab6f134664bafcab961446aa81667aedea47abf6' 
  AND token = 'JeS+QrEHJt/yoQt9O5Jb2uM24GHw1X97oXcJsOih4ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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