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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe13d9dcfeecff0aca77d4f9ceb770036cc1fb9a658e91fc592e3bc032c7ea3a' 
  AND token = 'TDlw6ZdUtoHHw9nwMb6xb7+YThFA/iI0RzmB25Gce+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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