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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0930e52bdecec5d81e0485dee8129ab023bf156c57983628a2ee0ebeee9d3b1' 
  AND token = 'AHNzssIfzKBtfwKjdCH6Kr96indU2q5Jyx+xsBzYR8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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