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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee86472cb43a34995ebae2d51923a02c4f442f8350929f9d9438274d32344a9' 
  AND token = 'NtxDIligf8sAjazY4yK+y4VoIjhSy6WYX/p2DfU4KHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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