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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcd00e50779e95bf9148cc6271305a4dc35f68bd414016b6342a6cf587aebb2' 
  AND token = 'FfCiJmIP2mdxjXY7agwabfGgYpAttdWN1S/YuvAHiFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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