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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6469592de3670da5da37fd38ed8205b18717d524bd57f256904d2e686928e4' 
  AND token = 'fAUnOSDl4rEnph/ymY/4QIaYoAJ0AET7f2yoggXxiEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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