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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f9c68ce8dc0b5091a4db0264f40afe69283174bd13027a8bfaea5ef9a32c36' 
  AND token = 'xhtBl1zeqUX9whXi8m73KBx/1VgTOs+f/B31lSboDAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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