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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de03e711a5dabec5dbdbfdb26b5f719ee65d060811d0c6406566ea7a2869baa' 
  AND token = 'GM2yo0ULKxWo9aaZIDr0fy6SO+4TTs9B3J3gVW43Cs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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