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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99282a06942ee80a4d9de054069970192790c6c999badac51e2f79953f528a79' 
  AND token = 'AvKmeHzJ/0lsgWrNiOjGR/fghra7/jGhwFu/HuDoG1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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