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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a24557b3aecf40734586c9ca5714bc3d43782a67b3f49db1574285762dc02a' 
  AND token = 'B35wAipfyQfo6VAXQj9CPtWs2NbgOs7alJwRGHrSr8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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