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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc6914b1d0d63369d02439fe59fa80b4913e5b216494a471fd7965710186b48' 
  AND token = 'BV4GML7To2pYgSOZeDoXUb6ZDcqJvelZqPiqT243oEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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