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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a55e61f1581908bb864ad7b189188edf94f6a6fdb11d1f81bc3865bcb8ac56f' 
  AND token = 'r+uEFYetYRk4LHLJCb/44C2+sXt3bT0lvfg60Gw2aKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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