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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302db979041674d2a5dfc1deae559d08349429a634f3dd2e0fa7739a38a609fb' 
  AND token = '3TuWe66APzcMm/PsECoxrNdWNcEHsg4p8LHF90zC4ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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