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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbf4d9334296a9452692977d45195d059d35a7dd50096c960ffa6230b89744f' 
  AND token = 'XZlII2wjOVNeHQR14TFJBctXo4PGBs9HCc7JuNvi7FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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