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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0dc9ccdaa9638d6f4eec28458779df4afbcc3e94b2868173864c604967ada4' 
  AND token = 'G7lLT5O7PmYeSax9vek3x/zcy2lJbRtDd5q5SCQDj7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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