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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660bd0b2e83f244dff58fa76e5c8c6bef9c26c83e94ca72797228b6456f6adcc' 
  AND token = 'F3WtFsGfMWzDi482tj0l8GqMMeZiMmHI82fsfn32yRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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