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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1724c27311783f4538783b55f6fec125b3632d76edb7943d727ade64c93034d4' 
  AND token = 'LiOckuczdG+WyfmGo4/az5VNrQaIY7YCEo86BULVm9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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