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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1770a8b926fdfd86e404f47ce81f168596461c82b30f7c58d7de00977d655c' 
  AND token = 'QGH1WJkIEJOCtuWY14uk2Q1UPzpuyHE56WoKyT89E5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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