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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f48e576c7598e33b779878c4357b5254be3a7bb515094e458dceedb73db38a8' 
  AND token = '76bIF9e0RPRZ04PE7FkO09YNK3lOtBFM+KLGx0nGzPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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