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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a036b41094b8a535a10f24846179d97f6c0e3ed42c528de031e0937ba10c27a' 
  AND token = 'YVwGUvU1zlVWHuD9+b3HsEmBKedu8K8ma1jkF4ayO0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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