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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c2d4d2ff2ec54cb25bb25243db297d6820a5029ac8c4389438b2acc3668f56' 
  AND token = 'As8kCB5aLhO7yXid+1x2Hf0vo75LOeeeXLh6IbZ3AHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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