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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34aba0c2d3f63147cd815b903e08198b62bb74c5bbc3eaa2420ca2c02f74248c' 
  AND token = '2RtUs8itDOSF64dvkWY3bCqlnNFFUqMLRxCdiZ93v1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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