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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd515f3bb6af903d3ef80a00e5dddc9ab84c463d592e5bdb45dcdc03ccda866a7' 
  AND token = 'F965qML9En9fMwgXECj44gYlgc0hhw7RWquRfEETUHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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