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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247ba2d6f10391e62d508936323ee1e2ca671590666bd318cc4c32f19581ed78' 
  AND token = 'T5i8jGcCfaWo1ZvW8begWsF18tGFAK4BvkHEFIUtkVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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