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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e172dd9e1d3a73980f536f17395013366967dfb57077666bbf214764d52434' 
  AND token = 'FTIioxRmvlvnMM6GRoqDqwjwKAHiS3RxhGNydDj+/64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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