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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa26ccb2230e0245f74e0fad41e3bd2002ee8e2a94c7bd581f9bf1ebea72924e' 
  AND token = '8b5CeJ+RkZpgar2ZWuwF2+lVEc4tfmuYDbnSjB+/TWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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