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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d6ec2123144e7a59391887d53fa40335518c7af8d1bef455b6ae38b64b56e7' 
  AND token = 'olPU5yTl0il6yLeEgUo13TdvF27ltWAHy9etau5lJ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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