SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd1dc6c75dc14752d96f562c3b6d708787fe3fb6e10c6229729ba777292cc47' 
  AND token = '/8JJ8w1vr5h4MCZAmqykj/GED3NzvcYgQgW2EAuhPKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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