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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fd8457126fdb22560253193b3f9f734883e729f4017ba2c1b7ed17e41dbb15' 
  AND token = '6QqzurjsGZzDrQ1K2mU7awy9DmCGyoCo33Wt8sZL6kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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