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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee77020822ce86ed46297a3e6952f96123da2e13464c003968a96691d9995d5f' 
  AND token = 'czlWUJ9iZrNDL+jsOMU7+Okx5/3wKD4Fn/WXrohdyXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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