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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cd44621f26b7cee39b9a4307cf3e6b92b46962272f28aa9851a8ed4581014e' 
  AND token = 'ezzzWg85w/MO+Iql1SI/zWZ0opseezc+sHVzKtaX/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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