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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1333dabdb4048475c7c6c35351fc8bb44a9f44610fc4dcd01ee722a714c1c537' 
  AND token = 'heOz6WWWrPQ2l59a9zOwethE03QmZJJlkSvCffVb0T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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