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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804523de05c3569a9a177f5795baf4652e421b6d82c3de53052d2594cfaaa8c2' 
  AND token = 'rDbPwTDx1vJej3JxkrLKvNFWNKSmD+vWdy4CpDPaSoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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