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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635346c2fe030eb6aba8011116172aa047f77bb563ef703d4680d2a6397f33f3' 
  AND token = 'cWPHsTSSV1ttck/+i2xvR3xjvD2HbTTDX2rGl+K3GQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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