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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4b4281e2bff87c787901dbad11a33455f2c55e6f76d5c3de0945acada9cae3' 
  AND token = '1tJEJvTpNoZwXlOYmfF677V8oth+yAre6VEgOdD546g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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