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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47e0989ec16b517f507f7d59e91d886be4d9f6dbfa1230e2a55bfb7d10da6ed' 
  AND token = 'Eyh2p6Ppx4Vw4r0ta9IA5nTJSCwKoEW4DOBgDdozsvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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