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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a746bcaeb106ac1e988703d2407fb41ad61ca805e2999c06cb6900f4fe588dba' 
  AND token = '2r6vI7vXACKcxmJDjHJSAHD9bCwMGvS+FAU6i5kNffI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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