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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5bb84749fd97ffe0b5927108b58e5a928b7e88fde3afbe8e567072d5c486c0' 
  AND token = 'b0xdpeWpsjVDUh3wa5vNkIgtkoRCH54G6gYgCtH6sy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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